我是否缺少一个步骤来处理 wso2esb 序列中的 xpath 表达式？

Question

我已经搞砸了几个小时，我不确定问题出在哪里。现在我只是想记录一个 XML 文件的 xpath 表达式的结果，该文件从代理传递到一个序列。到目前为止，我的表情没有被记录下来。我已经用几种不同的方式更改了表达式和名称空间，但我无法让信息显示在日志中。我可以看到完整记录了 XML 文件，但看不到我尝试使用 xpath 提取的数据。当我运行插件中的 xpath 时，我能够很好地提取数据，所以我认为这不是实际表达式的问题。

谁能把我推向正确的方向？我猜这可能是 XML 格式或命名空间的问题，但我不是 100% 确定。

谢谢。

序列

<sequence xmlns="http://ws.apache.org/ns/synapse" name="MySequence">
<log level="custom">
  <property name="sequence" value="MySequence"></property>
</log>
<property xmlns:ns="http://org.apache.synapse/xsd" name="filename" expression="get-property('transport', 'FILE_NAME')"></property>
<log level="custom">
  <property xmlns:ns="http://org.apache.synapse/xsd" name="show-name" expression="get-property('filename')"></property>
  <property xmlns:ns="http://org.apache.synapse/xsd" name="file-name" expression="get-property('targetfilename')"></property>
</log>
<log level="custom">
  <property xmlns:rs="urn:schemas-microsoft-com:rowset"
xmlns:ns="http://org.apache.synapse/xsd" xmlns:z="RowsetSchema" 
name="sequenceExp" expression="count(//xml/rs:data/z:row)"></property>
</log>
<property xmlns:ns2="http://org.apache.synapse/xsd" 
xmlns:ns="http://org.apache.synapse/xsd" 
name="transport.vfs.ReplyFileName" expression="fn:concat(get-
property('SYSTEM_DATE', 'yyMMddHHmmss'), '-', 
get-property('filename'))" 
    scope="transport"></property>
 <property name="OUT_ONLY" value="true"></property>
 <send>
  <endpoint name="FileEpr">
     <address uri="vfs:file:///var/process/rrout"></address>
  </endpoint>
 </send>
</sequence>

XML 输入数据（以模式开始，xml 元素的第二个子元素是实际数据）

<xml xmlns:s='uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882'
xmlns:dt='uuid:C2F41010-65B3-11d1-A29F-00AA00C14882'
xmlns:rs='urn:schemas-microsoft-com:rowset'
xmlns:z='RowsetSchema'>
<s:schema id='RowsetSchema'>
    <s:elementType name='row' content='eltOnly'>
        <s:attributeType name='iQuizID' rs:number='1' 
    rs:writeunknown='true'>
        <s:datatype dt:type='int' dt:maxLength='4' rs:precision='10' rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='iALSQuizNumber' rs:number='2' rs:writeunknown='true'>
        <s:datatype dt:type='int' dt:maxLength='4' rs:precision='10' rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='iBookID' rs:number='3' rs:writeunknown='true'>
        <s:datatype dt:type='int' dt:maxLength='4' rs:precision='10' 
    rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='vchBookType' rs:number='4' rs:nullable='true' 
    rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='10'/>
    </s:attributeType>
    <s:attributeType name='vchQuizType' rs:number='5' 
    rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='2' 
        rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='vchQuizTypeDesc' rs:number='6' 
    rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='50' 
    rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='tiShowPointsInAR' rs:number='7' 
    rs:writeunknown='true'>
        <s:datatype dt:type='ui1' dt:maxLength='1' rs:precision='3' 
        rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='tiAudioEnabled' rs:number='8' 
    rs:writeunknown='true'>
        <s:datatype dt:type='ui1' dt:maxLength='1' rs:precision='3' 
    rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='tiAudioStatus' rs:number='9' 
    rs:writeunknown='true'>
        <s:datatype dt:type='ui1' dt:maxLength='1' rs:precision='3' 
    rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='chTitlePrefix' rs:number='10' 
    rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='5' 
        rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='vchBookTitle' rs:number='11' 
    rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='255' 
    rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='vchAuthorFirstName' rs:number='12' 
    rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='30' 
    rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='vchAuthorMiddleName' rs:number='13' 
    rs:nullable='true' rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='30'/>
    </s:attributeType>
    <s:attributeType name='vchAuthorLastName' rs:number='14' 
    rs:nullable='true' rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='30'/>
    </s:attributeType>
    <s:attributeType name='vchLanguageCode' rs:number='15' 
    rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='4' 
        rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='vchLanguage' rs:number='16' 
    rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='50' 
    rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='iFiction' rs:number='17' 
    rs:writeunknown='true'>
        <s:datatype dt:type='ui1' dt:maxLength='1' rs:precision='3' 
    rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='vchFiction' rs:number='18' 
    rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='20' 
        rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='tiOutOfPrint' rs:number='19' 
    rs:writeunknown='true'>
        <s:datatype dt:type='ui1' dt:maxLength='1' rs:precision='3' 
    rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='vchOutOfPrint' rs:number='20' 
    rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='20' 
        rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='iReadingLevel' rs:number='21' 
    rs:writeunknown='true'>
        <s:datatype dt:type='float' dt:maxLength='8' rs:precision='15' 
        rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='vchInterestLevel' rs:number='22' 
    rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='10' 
        rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='iARPoints' rs:number='23' 
    rs:writeunknown='true'>
        <s:datatype dt:type='float' dt:maxLength='8' rs:precision='15' 
        rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='flATOS' rs:number='24' rs:nullable='true' 
    rs:writeunknown='true'>
        <s:datatype dt:type='float' dt:maxLength='8' rs:precision='15' 
    rs:fixedlength='true'/>
    </s:attributeType>
    <s:attributeType name='txBookSummary' rs:number='25' 
    rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' 
        dt:maxLength='2147483647' rs:long='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='iWordCount' rs:number='26' 
    rs:writeunknown='true'>
        <s:datatype dt:type='int' dt:maxLength='4' rs:precision='10' 
        rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='iNumberQuestions' rs:number='27' 
    rs:writeunknown='true'>
        <s:datatype dt:type='int' dt:maxLength='4' rs:precision='10' 
    rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='iQuizStatus' rs:number='28' 
    rs:writeunknown='true'>
        <s:datatype dt:type='int' dt:maxLength='4' rs:precision='10' 
    rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='dtOriginalApprovalDate' rs:number='29' 
    rs:nullable='true' rs:writeunknown='true'>
        <s:datatype dt:type='dateTime' rs:dbtype='timestamp' 
        dt:maxLength='16' rs:scale='3' rs:precision='23' 
    rs:fixedlength='true'/>
    </s:attributeType>
    <s:attributeType name='vchDifficultyLevel' rs:number='30' 
    rs:nullable='true' rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='30'/>
    </s:attributeType>
    <s:attributeType name='vchQuizISBN' rs:number='31' 
    rs:nullable='true' rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='25'/>
    </s:attributeType>
    <s:attributeType name='iContentID' rs:number='32' 
    rs:writeunknown='true'>
        <s:datatype dt:type='int' dt:maxLength='4' rs:precision='10' 
    rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='tiRecordStatus' rs:number='33' 
    rs:writeunknown='true'>
        <s:datatype dt:type='ui1' dt:maxLength='1' rs:precision='3' 
    rs:fixedlength='true' rs:maybenull='false'/>
    </s:attributeType>
    <s:attributeType name='vchBookTitleContrived' rs:number='34' 
    rs:nullable='true' rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' 
        dt:maxLength='1024'/>
    </s:attributeType>
    <s:attributeType name='vchAuthorContrived' rs:number='35' 
    rs:nullable='true' rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='500'/>
    </s:attributeType>
    <s:attributeType name='vchCountry' rs:number='36' rs:nullable='true' 
    rs:writeunknown='true'>
        <s:datatype dt:type='string' rs:dbtype='str' dt:maxLength='10'/>
    </s:attributeType>
    <s:attributeType name='iSponsor' rs:number='37' rs:nullable='true' 
    rs:writeunknown='true'>
        <s:datatype dt:type='int' dt:maxLength='4' rs:precision='10' 
        rs:fixedlength='true'/>
    </s:attributeType>
    <s:attributeType name='dtLastApprovalDate' rs:number='38' 
    rs:nullable='true' rs:writeunknown='true'>
        <s:datatype dt:type='dateTime' rs:dbtype='timestamp' 
        dt:maxLength='16' rs:scale='3' rs:precision='23' 
        rs:fixedlength='true'/>
     </s:attributeType>
    <s:extends type='rs:rowbase'/>
    </s:elementType>
</s:schema>
<rs:data>
<z:row iQuizID='18636' iALSQuizNumber='1' iBookID='3093' vchBookType=' ' 
vchQuizType='RP' vchQuizTypeDesc='Reading Practice'
     tiShowPointsInAR='1' tiAudioEnabled='0' tiAudioStatus='0' 
chTitlePrefix='     ' vchBookTitle='Adam of the Road'
     vchAuthorFirstName='Elizabeth' vchAuthorMiddleName='Janet' 
vchAuthorLastName='Gray' vchLanguageCode='EN' vchLanguage='English'
     iFiction='1' vchFiction='Fiction' tiOutOfPrint='0' 
vchOutOfPrint='In Print' iReadingLevel='6.5' vchInterestLevel='MG'
     iARPoints='9' flATOS='9' txBookSummary='This book describes the 
adventures of eleven-year-old Adam as he travels the open roads of 
thirteenth-century England searching for his missing father, a minstrel, 
and his stolen red spaniel, Nick.'
     iWordCount='57357' iNumberQuestions='10' iQuizStatus='1' 
dtOriginalApprovalDate='1996-04-10T00:00:00' vchDifficultyLevel=' '
     vchQuizISBN=' ' iContentID='118636' tiRecordStatus='1' 
vchCountry='US;CA' dtLastApprovalDate='2000-02-24T00:00:00'/>
<z:row iQuizID='18637' iALSQuizNumber='2' iBookID='3094' vchBookType=' ' 
vchQuizType='RP' vchQuizTypeDesc='Reading Practice'
     tiShowPointsInAR='1' tiAudioEnabled='0' tiAudioStatus='0' 
chTitlePrefix='     ' vchBookTitle='All-of-a-Kind Family'
     vchAuthorFirstName='Sydney' vchAuthorMiddleName='' 
vchAuthorLastName='Taylor' vchLanguageCode='EN' vchLanguage='English'
     iFiction='1' vchFiction='Fiction' tiOutOfPrint='0' 
vchOutOfPrint='In Print' iReadingLevel='4.9000000000000004'
     vchInterestLevel='MG' iARPoints='5' flATOS='5' txBookSummary='Five 
 girls have simple but happy times, with parents rich in kindness but 
 poor in money.'
     iWordCount='32006' iNumberQuestions='10' iQuizStatus='1' 
 dtOriginalApprovalDate='1996-04-10T00:00:00' vchDifficultyLevel=' '
     vchQuizISBN=' ' iContentID='118637' tiRecordStatus='1' 
  vchCountry='US;CA' dtLastApprovalDate='1996-09-19T00:00:00'/>
   </rs:data>
 </xml>

------------ 编辑您可以通过将代理中的 contentType 更改为 'application/xml'.

来解决此问题

Answer 1

expression="count(//xml/rs:data/z:row)"

我能想到为什么这会崩溃：

您没有绑定命名空间，因此无论执行您的表达式，您的配置文件都不知道这些命名空间，除非它 "magically" 知道它们。
该工具的数据 "seen" 可能是实际的 rs:Data，而不是还包括 xml 根节点和整个模式的整个数据集

因为我不知道您使用的环境，让我们重写您的表达式，使其独立于名称空间或根元素：

expression="count(/*//*[local-name(.) = 'data']/*[local-name(.) = 'row'])"

（在根节点后添加 // 以防结构与您显示的不同）如果即使失败，请考虑使用更荒谬的东西来确保甚至评估 XPath：

expression="concat('Hello world, count words: ', //@iWordCount[1])"

由于属性不在命名空间中，因此应该输出 iWordCount 的第一个值。如果returns为空，就知道你认为的文档有焦点，没有焦点。这是找出前三个元素名称的方法：

expression="concat('Hello: ', name(/*[1]), name(/*/*[2]), name(/*/*/*[1])"

这应该输出："Hello: xml rs:data z:row"

如果不是，它至少应该指出您实际正在查看的数据。

我是否缺少一个步骤来处理 wso2esb 序列中的 xpath 表达式？

Am I missing a step in order to process xpath expression in a wso2esb sequence?

xpath

sequence

wso2esb